The word "uncopyrightable" is the longest English word in normal use that contains no letter more than once.

A sentence that contains all 26 letters of the alphabet is called a "pangram".

The following sentence contains all 26 letters of the alphabet: "The quick brown fox jumps over the lazy dog." This sentence is often used to test typewriters or keyboards.

The only word in English that ends with the letters "-mt" is "dreamt" (which is a variant spelling of "dreamed") - as well of course as "undreamt"

A word formed by joining together parts of existing words is called a "blend" (or, less commonly, a "portmanteau word"). Many new words enter the English language in this way. Examples are "brunch" (breakfast + lunch); "motel" (motorcar + hotel); and "guesstimate" (guess + estimate). Note that blends are not the same as compounds or compound nouns, which form when two whole words join together, for example: website, blackboard, darkroom.

The word "alphabet" comes from the first two letters of the Greek alphabet: alpha, bēta.

The dot over the letter "i" and the letter "j" is called a "superscript dot".

In normal usage, the # symbol has several names, for example: hash, pound sign, number sign.

In English, the @ symbol is usually called "the at sign" or "the at symbol".

If we place a comma before the word "and" at the end of a list, this is known as an "Oxford comma" or a "serial comma". For example: "I drink coffee, tea, and wine."

Some words exist only in plural form, for example: glasses (spectacles), binoculars, scissors, shears, tongs, gallows, trousers, jeans, pants, pyjamas (but note that clothing words often become singular when we use them as modifiers, as in "trouser pocket").

The shortest complete sentence in English is the following. "I am."

The word "Checkmate" in chess comes from the Persian phrase "Shah Mat" meaning "the king is helpless".

We pronounce the combination "ough" in 9 different ways, as in the following sentence which contains them all: "A rough-coated, dough-faced, thoughtful ploughman strode through the streets of Scarborough; after falling into a slough, he coughed and hiccoughed."

The longest English word without a true vowel (a, e, i, o or u) is "rhythm".

The only planet not named after a god is our own, Earth. The others are, in order from the Sun, Mercury, Venus, [Earth,] Mars, Jupiter, Saturn, Uranus, Neptune.

There are only 4 English words in common use ending in "-dous": hazardous, horrendous, stupendous, and tremendous.

We can find 10 words in the 7-letter word "therein" without rearranging any of its letters: the, there, he, in, rein, her, here, ere, therein, herein.

The following sentence contains 7 identical words in a row and still makes sense. "It is true for all that that that that that that that refers to is not the same that that that that refers to." (= It is true for all that that that that which that that refers to is not the same that which that that refers to.)

The "QWERTY keyboard" gains its name from the fact that its first 6 letter keys are Q, W, E, R, T and Y. On early typewriters the keys were arranged in such a way as to minimize the clashing of the mechanical rods that carried the letters.